Ship construction



Dec. 11, 1934. J. w. ISHERWOOD SHIP CONSTRUCTION Filed Dec. 8, 1932 r L W k b W J Patented Dec. 11, 1934 UNITED STATES PATENT OFFICE land ApplicationDecember 8, 1932, Serial No. 646,337

In Great Britain 5. Claim.

This invention relates to the construction of floating vessels and has for its object the improvement of such construction by which there is a reduction in the amount of metal used, and a construction result which is more eflicient than those heretofore proposed.

With these and other objects in view this invention resides in the novel details of construction and combinations of parts as will be disclosed more fully hereinafter and particularly pointed out in the claims.

Referring to the accompanying drawing forming a part of this specification in which like numerals designate like parts in all the views,

Fig. 1 is a horizontal sectional view through the plating and a transverse bulkhead taken as above the longitudinals;

Fig. 2 is a vertical sectional view of the parts shown in Fig. 1 taken as on the line 22 thereof and looking in the direction of the arrows; and

Fig. 3 is a. vertical transverse sectional View of the same parts taken as on theline 3-3 of Fig. 2 and looking in the direction of the arrows.

In order that this invention may be the better understood, reference is made to U. S. Letters Patent No. 1,622,830 granted March 29, 1927 to Joseph W. Isherwood in which there is described a floating vessel having transverse bulkheads, one or more transverse frames between the bulkheads and a great plurality of longitudinals attached directly to the skin plating, and passing through the transverse frame or frames, the longitudinals being stopped short of the bulkheads and their ends being unbracketed to said bulkheads. In other words, according to the said patent the strength of the vessel is insured by closely spaced relatively small longitudinals and relatively heavy transverse frames with the bulkheads fitted between the framing, and when it is desired to maintain the full longitudinal strength of the structure, doubling plates, or increased thickness of plating can be fitted in way of the transverse bulkhead.

According to this present invention the same general type of ship construction is contemplated, that is to say the relatively heavy frames and the closely spaced longitudinals will be used, said longitudinals being of lesser transverse dimension than those heretofore proposed outside of the D Isherwood system ofship construction. The es- December 19, 1931 bars of suitable cross sectional area with respect to the longitudinals to which they are securely fastened, the transverse bulkheads being suitably apertured to permit passage therethrough of said back bars.

According to the present invention the unbracketed ends of the longitudinals, in the vicinity of the transverse bulkheads, are fitted with back bars, without doublings or brackets used to secure the longitudinal to the bulkhead, which back bars extend through the transverse bulkheads. Preferably the transverse bulkheads are slotted or notched out and the boundary bars cut to allow the back bars to extend through, and the intersection where the back bar passes through the bulkhead is rendered watertight, for example, by welding or in any other convenient manner. The essential feature of this invention is that the transverse bulkheads are slotted out or notched to allow the back bars which are attached to the shell plating of the vessel to extend therethrough, as contradistinguished from the construction disclosed in said Patent No. 1,622,830 wherein the longitudinals are interconnected by a doubler which passes under the transverse bulkhead.

Referring to the drawing 1 represents the transverse bulkhead, 2 the boundary bars, 3 and 4 aligned longitudinals, and 5 the shell plating. 6 is a back bar which is attached to the longitudinalsand the shell plating in any convenient manner for example by rivets or welding (not shown). In order that the back bar 6 may be connected to both longitudinals, the transverse bulkhead is slotted or notched out to closely fit the back bar as indicated at 7, and the boundary bars cut, the intersection of these members being made watertight by welding.

Such a construction results in more efficiency in way of the unbracketed longitudinals and permits of the doublings being eliminated or, when fitted, reduced in thickness while still assisting in maintaining the full longitudinal strength.

It is obvious that those skilled in the art may vary the details of construction as well as arrangements of parts without departing from the spirit of the invention, and therefore it is not desired to be limited to the foregoing except as may be required by the claims.

What is claimed is:-

1. In ship construction the combination of shell plating, a transverse bulkhead, longitudinals having ends devoid of attachment to said bulkhead, and' back bars fitted to the ends of the longitudinals in the vicinity of said bulkhead, which back bars extend through said bulkhead 55 in continuous contact with and secured to said plating.

2. In ship construction a joint formed by and comprising the shell plating, a transverse bulkhead, boundary bars, a back bar, and two aligned longitudinals, wherein the edge of the bulkhead is brought into contact with a surface of the plating and secured thereto on opposite sides by the boundary bars, the longitudinals are secured in contact with said plating surface and stop at the boundary bars, and said longltudinals are connected by the back bar in continuous contact with said plating surface and extending through the bulkhead between said boundary bars.

3. In ship construction ajoint formed by and comprising the shell plating, a transverse bulkhead, boundary bars, a back bar, and two aligned longitudinals, wherein the edge of the bulkhead is brought into contact with a surface of the plating and secured thereto on opposite sides by the boundary bars of continuous extent in the way of the longitudinals, the longitudinals are secured in contact with said plating surface and stop at the boundary bars, and said longitudinals are connected by the back bar in continuous contact with said plating surface and extending through the bulkhead between said boundary bars.

4. A joint for ship construction comprising a wall having a surface, a member extending transversely of said wall, a pair of reinforcing members extending longitudinally of said wall surface, a

single connector strip joining the ends of said longitudinal members, and a plurality of angles secured to an edge portion of said transverse member, all of said members as well as said connector strip and said angle bars so disposed relative to each other that each has a continuous surface secured to and lying in the plane of the surface of said wall, whereby jogging or overlapping of the members is avoided, the edge of said transverse member being apertured to accommodate the connector strip, the angle bars being of a length to meet the connector strip, and the ends of the longitudinal reinforcing members meeting said angle bars, whereby said joint is made substantially closed.

5. In ship construction the combination of shell plating; a transverse bulkhead; boundary bars on the opposite sides of said bulkhead and securing the same to said plating, the edge of said bulkhead and a surface of said bars being in continuous surface contact with said plating; longitudinals in surface contact throughout their length with and secured to said plating and of lengths insuflicient to reach said bulkhead; and a back bar in continuous surface contact with and secured to said plating, and rigidly connecting the ends of two aligned longitudinals, said back bar passing unmutilated through said bulkhead andbetween said boundary bars.

JOSEPH WILLIAM ISHERWOOD. 

